Milorganite 6-4-0 Lawn Bag Calculator
Calculate Milorganite 6-4-0 biosolid fertilizer bags for a lawn from a target nitrogen rate, with coverage per bag and total bags needed.
How This Calculation Works
Product pounds per acre equals the target nitrogen rate divided by the analysis percentage, times 100. For 48 pounds of nitrogen per acre from 6-4-0, that is 800 pounds of product per acre. Dividing by the 36 pound bag gives about 22 bags per acre, or about 0.5 bag per 1,000 square feet.
Field Calibration & Rate Reference Chart
| Analysis | Nutrient % | Target lb/ac | Product lb/ac |
|---|---|---|---|
| 46-0-0 Urea | 46 | 100 | 217 |
| 46-0-0 Urea | 46 | 120 | 261 |
| 34-0-0 AN | 34 | 100 | 294 |
| 28-0-0 UAN | 28 | 120 | 429 |
| 18-46-0 DAP | 46 | 60 | 130 |
| 11-52-0 MAP | 52 | 60 | 115 |
| 0-0-60 Potash | 60 | 80 | 133 |
| 10-10-10 | 10 | 60 | 600 |
| 19-19-19 | 19 | 80 | 421 |
| 6-4-0 Milorganite | 6 | 48 | 800 |
Common Questions
How many bags of Milorganite do I need for my lawn?
Divide the target nitrogen rate by 0.06 to get product per acre, then divide by the 36 pound bag weight. A 48 pound nitrogen target needs about 800 pounds, or 22 bags, per acre. Scale to your lawn area.
Can Milorganite burn my lawn?
Its low analysis and slow release make it very unlikely to burn, even if slightly over-applied. That safety margin is why it is popular for summer feeding. Still spread it evenly to avoid smothering patches.
How often should I apply Milorganite?
Most lawn programs apply it three to four times per season, roughly every 6 to 8 weeks during active growth. Its slow release feeds steadily between applications. Avoid applying to frozen ground.
What is the analysis of Milorganite?
Milorganite is a 6-4-0 biosolid fertilizer, meaning 6 percent nitrogen, 4 percent phosphate and no potash. It also contains iron and other micronutrients. The low analysis means higher application rates than synthetic products.